n the old days, sites were more reliable and agencies reputable. Nowadays, for every day hookers, there are a lot of sites, but with poor quality. Also, in general, it may take texts to 5 or more providers (I use Hushed) to get a return text. I have no idea what this is all about.

One thing to note, the $140/$160 Asian providers, no matter what the site,  seem to be all legitimate but, of course, the picture never matches the provider. Usually, I have been able to add a BBBJ for $30 or so.  
These are my observations for Boston, but I would think that the experience would be mostly the same, no matter the city.
Here's my annotated list:
https://adultsearch.com/massachusetts/boston/female-escorts/?ipp=90 Seems mostly real, often quotes prices
https://megapersonals.eu/home Seems like there are a lot of hard to believe ad ($100 for an hour). Scammy
https://sumosear.ch Decent stuff, but it is best used for its reverse search function. See if they are posting in many cities at the same time, if they post under  many names, and so  on. Doesn't seem to be a good primary resource
https://yolo.com.listcrawler.eu/brief/escorts/usa/massachusetts/boston/1 I haven't  tried this out much. Used to seem fake, but now looks more legitimate
https://www.adultlook.com/l/boston-ma/female-escorts Nic pics. Haven't really checked it out
https://www.eroticmonkey.ch  Looks OK, but requires membership to get phone numbers  -- NOT!
https://boston.sugarnights.com/escorts Has anyone checked this out?
There are more sites that I am not listing that are more on the pricey side, but I will not review. It's hard to get $300 out of my pocket for any visit unless it is a lesbian threesome.
https://skipthegames.com A reverse bu picture search site. Seems useful